Mechanism for stripping a drawn container from the punch of a deforming tool

ABSTRACT

The combination is used in the mechanism for forming and stripping a container having a mouth wherein the container is formed on a punch during the inserting portion of a deformation stroke through a deforming die and stripped from the punch during the withdrawing portion of the deformation stroke. An annular stripper member is located ahead of the deforming die and is disposed around and in a zone of movement during the deformation stroke. The stripper member is effective to strip the container from the punch during the withdrawing portion of the deformation stroke. Beveled means is adapted to act upon the peripheral edge of the mouth of the container against a peripheral edge section of the deforming die. Consequently, a conically-shaped widened portion is formed along the peripheral edge of the container mouth. The beveled means is effective to form the conically shaped widened portion toward the end of the inserting portion of the deformation stroke. The stripper member includes a stripper surface disposed obliquely with respect to the axis of the punch and is effective to abut the widened mouth portion on the withdrawing portion of the stroke thereby causing the container to be removed from the punch.

Klnited States Patent [191 Hortig Oct. 7, 1975 1 MECHANISM FOR STRIPPINGA DRAWN CONTAINER FROM THE PUNCH OF A DEFORMING TOOL Wilhelm Hortig,Auerbach, Germany 22 Filed: May 15, 1974 21 App]. No.: 470,260

[75] Inventor:

[30] Foreign Application Priority Data May 25, 1973 Switzerland 7570/73[52] US. Cl. 72/344; 72/345; 72/346; '72/361 [51] Int. Cl. B21D 45/08[58] Field of Search 72/344, 345, 346, 361

[56] References Cited UNITED STATES PATENTS 3,295,351 l/1967 Jacobs72/344 3,418,839 12/1968 Hlavac 72/344 FOREIGN PATENTS OR APPLICATIONS1,117,905 3/1956 France 72/345 150,377 4/1904 Germany 72/344 PrimaryExaminerLowell A. Larson Assistant Examiner-Joseph A. WalkowskiAttorney, Agent, or Firm-Neil F. Markva [57] ABSTRACT The combination isused in the mechanism for forming and stripping a container having amouth wherein the container is formed on a punch during the insertingportion of a deformation stroke through a deforming die and strippedfrom the punch during the withdrawing portion of the deformation stroke.An annular stripper member is located ahead of the deforming die and isdisposed around and in a zone of movement during the deformation stroke.The stripper member is effective to strip the container from the punchduring the withdrawing portion of the deformation stroke. Beveled meansis adapted to act upon the peripheral edge of the mouth of the containeragainst a peripheral edge section of the deforming die. Consequently, aconically-shaped widened portion is formed along the peripheral edge ofthe container mouth. The beveled means is effective to form theconically shaped widened portion toward the end of the inserting portionof the deformation stroke. The stripper member includes a strippersurface disposed obliquely with respect to the axis of the punch and iseffective to abut the widened mouth portion on the withdrawing portionof the stroke thereby causing the container to be removed from thepunch.

18 Claims, 8 Drawing Figures U.S. Patent Oct. 7,1975 Sheet 1 of53,910,095

U.S. Patent Oct. 7,1975 Sheet 2 of 5 3,910,095

Fig. 2 i L ll US. Patent Oct. 7,1975 Sheet 3 of5 $910,095

US. Patent Oct. 7,1975 Sheet 4 of5 3,910,095

US. Patent Oct. 7,1975 Sheet 5 of5 3,910,095

MECHANISM FOR STRIPPING A DRAWN CONTAINER FROM THE PUNCH OF A DEFORMINGTOOL BACKGROUND OF THE INVENTION The present invention refers to amechanism for stripping a beaker-shaped container provided with awidened mouth, formed without a seam by deepdrawing and/orreduction-drawing, from the punch of a deforming tool, especially on anautomatic multistage press, with a stripper member arranged in the zoneof movement of the punch, which forces the container off the latter asthe punch returns.

Deformation presses used for the production of seamless metal containersare known to require strippers which strip the shaped containers, forexample, sheet steel shells for tins, from the punch as it returns.Consequently, the containers can be seized by the awaiting conveyormeans, e.g., tongs, grippers, etc and transferred to the nextdeformation station or to the delivery respectively.

Known strippers are annular stationary members surrounding the punchconcentrically, against which the top edge of the workpiece strikes asthe punch returns. The workpiece is held stationary with respect to thepunch as it returns further and is thereby released from the peripheryof the punch. The conveyor means then immediately seize the workpiece asit comes free and convey it further laterally in the direction of feed.

These known strippers are burdened with a series of disadvantages whichhitherto could not be eliminated in spite of systematic endeavours.

One of the difficulties encountered results, for example, from theeffective surface of the stripper lying parallel with the irregularannular surface of the workpiece facing it. Consequently, fortransmission of the stripping force merely the narrow irregular annularsurface of the top edge of the workpiece is available. Above all,however, it must be observed in this case that the top edge of theshaped workpiece which is to be stripped offis because of theunavoidable forming oflobes made wavy in shape; i.e., it exhibitsirregular recesses and projections which offer the stripper as a ruleonly very small areas of engagement. The consequence of this is that thestripping force is transmitted to the body of the container to one sideand this is jammed or deformed respectively or damaged in some otherfashion. This is associated generally with an interruption in operationif not actual damage of expensive parts of the tool.

SUMMARY OF THE INVENTION These disadvantages are to be eliminated by thepresent invention. The mechanism forming the object of the inventionincludes a stripper member having a stripper face running obliquely withrespect to the axis of the punch and being matched to the inclination ofthe widened mouth of the container. In at least one deformation stage ofany press, a beveled means or widener member is so arranged andpositively coupled with the downward movement of the punch, that towardthe end of the deformation stroke. I

In accordance with a special embodiment, the strip per member issupported movably on the outer face of the punch. The upwards stroke ofthe stripper member is limited by a stationary holder, i.e., oneindependent of the movement of the punch. The punch includes a strikermeans that is laterally displaced ahead of the top edge of the die. Thedistance of displacement is so selected that the stripper lies with theWidener beveled means against the mouth of the container at the bottomof the deadpoint of the zone of movement for the punch.

The stationary holder can be a holder-ring surrounding the punchconcentrically. The striker can be formed in the shape of an annularshoulder arranged on the periphery of the punch.

The stripper and the widener member form a single part the bottom bevelof which provides both the stripper face and also the widener face.

In accordance with another feature, the outer surface of the combinedstripper and widener member is conically tapered upwardly at least inits upper half. The holder is formed in the shape of a trap-bushsupported concentrically with the axis of the punch. The bore of theholder is coordinated with the eonicity of the stripper and widenermember. An annular flange is located at the upper face of the trap-bushand points radially toward the axis of the punch.

In accordance with a further embodiment of this invention, the stripperis a cylindrical sleeve fastened to the press frame. A row of stripperfillets are located in the bottom section of the frame and project fromthe inner wall of the stripper in the direction of the axis of thepunch. Longitudinal grooves having a shape corresponding to the stripperfillets are located along the periphery of the punch and run parallelwith respect to the axis of the punch. The bottom faces of the stripperfillets exhibit a bevel which corresponds with the required angle ofwidening of the container mouth.

BRIEF DESCRIPTION OF DRAWINGS Other objects of this invention willappear in the following description and appended claims, reference beingmade to the accompanying drawings forming a part of the specificationwherein like reference characters designate corresponding parts in theseveral views.

FIG. 1 is a simplified section of the first embodiment and shows thepunch at the bottom deadpoint of the deformation stroke,

FIG. 2 shows the embodiment shortly after stripping of the shapedcontainer,

FIGS. 30 and 3b illustrate the construction of a stripper,

FIGS. 4 and 5 show two further embodiments, and

FIGS. 6 and 7 illustrate constructional details.

DESCRIPTION OF SPECIFIC EMBODIMENTS The selected embodiments refer tothe deformation stage in a reduction-drawing press upon whichbeakershaped shells for tins are produced from sheet steel. The basicidea of the invention can however be realized in any desired stage ofdeformation in known deepdrawing presses, reduction-drawing presses andobviously also in a combination of these two types of press.

The mechanism displayed in FIGS. 1 and 2 with inessential detailsomitted exhibits a reduction-drawing punch I die 2. The die 2 isprovided with a known but not shown reduction-drawing ring into whichthe workpiece to be deformed is rammed by the punch and reduced indiameter and in respect of its wall-thickness.

The reduction-drawing punch l, hereinafter only called the punch,exhibits a punch head la which is connected detachably to the punch body1b by means of a fixing-pin 3.

1 A known pre-stripper 4 is supported in the central bore of the punchhead la. The frusto-conical stripper head 4a registers in acorrespondingly shaped recess 5 of the punch head la. A spiral spring 6biases the prestripper 4 in its bottom position in which the prestripperhead 4 projects from the recess 5.

The stripping movement of the pre-stripper 4 is limited by an ejectorhead 46 which is screwed into the axial bore in the pre-stripper and thetop part of which serves as the spring plate for the spiral spring 6.

The pre-stripper 4 is a hollow body having an axial bore 4b open at bothends. The punch body 1!; has an axial bore 7 which can be connected to asource of compressed air at connection 8. See FIG. 2.

The reduction-drawing punch 1 is held onto a clamphead 10 by a clampbolt 9 and driven to and fro by a known but not shown mechanism, forexample, a crank gear. Between the punch holder 1 1 and the bottom faceof the clamp-head 10, a setting-washer 12 is arranged.

The punch 1 provided with a shoulder 13 lies in accordance with FIG. 1at its bottom deadpoint at which the deformation process has ended andthe return of the punch is beginning. The workpiece clinging to theperiphery of the punch, in this case a circularcylindrical shell 14 fora tin, is during the return of the punch pulled up with it and must thenas soon as the punch has left the die be stripped from the periphery ofthe punch. For this purpose, a stripper 15 is disposed on the outersurface of punch head In. Stripper 15 can slide along the periphery ofthe punch once a predetermined limiting force has been exceeded. Thebottom headpoint position is reached when the punch shoulder 13 liesagainst the end surface of the stripper 15. See

FIG. 1.

The stripper l5 exhibits a sleeve 16 the bottom edge of which, facingthe die, has a conical taper l7 pointing downwards. The sleeve 16 isheld against the periphery of the punch by friction by twofriction-rings l8 supported in corresponding annular grooves, so thatthe stripper 15 during the upwards stroke of the punch 1 is taken by thelatter with it. Stripper 15 includes a slight conical surface thatencounters the likewise conically formed inner surface of a stationaryholder 20. Consequently, stripper 15 is held stationary while the punchl withdraws upwards. During this relative move ment between the punch land the stripper 15, the tinshell 14 seated on the bottom end section ofthe punch is stripped off.

The tin shell 14 is then taken over and conveyed onward by the conveyormember which is standing by. The mouth of the tin shell or container 14experiences a widening effect by the conical taper 17 on the stripper 15toward the end ofthe reduction-drawing or deformation stroke. Theconical taper constitutes beveled means that is effective to form aconically shaped widened portion along the periphery of the containermouth 19. The conically shaped widened portion 19 is laid against acorrespondingly shaped annular surface of peripheral edge section of thedeforming die or else experiences widening without support to its outersurface. Distance 11 of the shoulder 13 from the top edge of the die isso selected that stripper 15 lies with its widener bevel 17 against thecontainer mouth at the bottom deadpoint of the deformation stroke forthe punch.

The Widener bevel 17 of stripper 15 forms an angle of about 20 to 40 tothe horizontal. However, this angle can vary within wider limits inactual practice. In

this embodiment, the stripper surface and the Widener means for forminga conically shaped widened portion along the periphery of the mouth areconstituted by this same bevel 17 on stripper 15.

Stripper holder 20 includes a holder ring 21 that concentricallysurrounds punch 1. Ring 21 has an annular flange 22 projecting inwardlyat the top portion thereof and is closely fitted against the peripheralface of punch 1. A stirrup 23 is slidably disposed on a holder plate 24and holds ring 21 in place. Clamp bolts 25 fasten the plate 24 unto aholder bar 26 which is fastened to the frame of the press. Holder 20also includes holder magnets 47 which hold the stripper 15 firmly onceit is in a stationary seated position.

The specific embodiment as discussed hereinabove accomplishes twofunctions. First, the stripper 15 forms a stripping bevel in the shapedtin-shell 14 in the zone of its mouth. Secondly, the tin-shell 14 isstripped from the periphery of the punch 1. After the stripping bevel isshaped at the conical mouth, stripper 15 moves with punch l andtin-shell 14 out of the position shown in FIG. 1 and moves upwardlyuntil stripper 15 encounters holder 20. See FIG. 2. In this position,the conically shaped mouth-face of tin-shell 14 is pressed against theconical stripper face 17 as the punch 1 continues its upward stroke.Consequently, tin-shell 14 is stripped from the periphery of thepunch 1. The conically shaped portion of the tin-shell 14 provides acomplete contact uniformly over a large surface between the stripper 15and the tin-shell 14. Therefore, it is possible for a stripping force tobe transmitted without any deformation of the thin-walled portion of thetin-shell 14. The effective stripper face 17 is totally independent ofthe possible occurrence of forming lobes.

Another feature of the disclosed mechanism overcomes another possibleproblem occurring during the formation of the tin-shells. It is possiblethat one or more lobes may project upwardly from the circumference ofthe mouth of the tin-shell so that even after the tin-shell has beenstripped off from the punch, that the lobes will lie above the bottomedge of the stripper 15. Consequently, lateral conveyance of thetin-shells away from the stripper is prevented. During this process, thetin-shells can be deformed or jammed thereby severely impairing the flowof production. This problem is overcome by the further feature of theinvention as described hereinbelow.

Stripper 15 has eight blind bores offset with respect to each other by45 respectively. Spring-loaded thrusters 27 are slidingly supported ineach of the bores. A spiral spring 28 biases each thruster outwardlyfrom the bores. A stop 30 projects outwardly from each thruster into alongitudinal groove 29 thereby limiting the stroke of each thruster.Thrusters 27 include thrustcheeks 27a which project radially outwardlyto uniformly engage against the irregular rim of the mouth of thetin-shell 14 being formed. Thrusters 27 thereby set themselves againstthe top edge of the tin-shell l4 and resiliently force it downwardlyuntil the top edge of the tin-shell lies below the stripper 15. Thus, acollision between tin-shell 14 and stripper 15 is avoided during theonward conveyance to the next working zone.

FIG. 2 shows tin-shell l4 shortly after stripping from punch 1. Here theleft hand edge of the mouth at point 32 exhibits an extraordinarily highlobe which has been forced downwardly by thruster 27.

After the stripping process, stripper is held in the position shown inFIG. 2 by permanent magnets 47. Stripper 15 remains stationary until theshoulder 13 on punch 1 engages it during the next downward stroke ofpunch 1. FIG. 2b shows the yet undeformed tin-shell blank 33.

Another embodiment of a mechanism made in accordance with this inventionis shown in FIG. 4. The reduction-drawing punch 1 includes afrustoconical bevel shoulder 34 constituting beveled means adapted toact upon the peripheral edge of the mouth of the tin-shell beingdeformed. The shoulder 34 acts on the mouth of the tin-shell toward theend of the deformation stroke thereby taking over the function of theWidener bevel 17 shown in the embodiment of FIG. 1. The substantiallycylindrical stripper 35 is held stationary by stirrup 36 which isfastened to a slidable holder plate 24 in this particular embodiment.Clamp bolts 25 are used to attach holder plate 24 to the holder bar 26.In this embodiment, in the earlier embodiment, the mechanism is used forforming and stripping a container having a mouth wherein the containeris formed on a punch during the inserting portion of a deformationstroke through a deforming die and stripped from the punch during thewithdrawing portion of the deformation stroke.

Stationary stripper includes 8 inwardly projecting stripper fillets 37along its bottom portion. Fillets 37 include stripper faces 37 lyingobliquely with respect to the axis of the punch 1. Fillets 37 projectinto longitudinal grooves 39 which are arranged on the peripheralsurface of the reduction-drawing punch. Grooves 39 are parallel withrespect to the axis of punch 1. Fillets 37 slide within the grooves 39during the operation of the punch 37 and consequently lie at leastpartially within the contour of the punch.

Eight thrusters 38 are arranged around the periphery of stripper 35 andoffset with respect to each other by 45. Thrusters 38 are slidablymounted within blind bores under spring pressure and prevented fromdropping out by stops such those shown in the embodiment of FIG. 2.Thrusters 38 are circular-cylindrical steel pins having inwardlyprojecting lugs 38a disposed at their bottom ends. Lugs 38:! correspondto lugs 27a in the embodiment of FIG. 2.

In operation of this embodiment, the mouth of the tin-shell is firstwidened toward the ends of the stroke by the punch shoulder 34. Uponreturn of the punch 1,

the tips of the stripper fillets 37 catch in the mouth of the tin-shell.Stripper faces 37 are laid against the inner conical annular face of thewidened portion of the mouth and the tin-shell is subsequently strippedoff.

Occasionally, it ispossible that a lobe that is relatively high andprojecting out radially from the tin-shell will come between twoadjacent thrusters 38. Again, it is possible that the stripped tin-shellmay collide with the bottom edge of stripper 35 during lateralconveyance thereof. To preclude the possibility of this problem, afurther embodiment of the invention is shown in FIG. 5.

The embodiment of FIG. 5 shows a punch 1 having a widener shoulder (notshown) corresponding with shoulder 34 as shown in the embodiment of FIG.4. A gripper mechanism 38 is located above the die 2 and includesgripper cheeks 39 which embrace a stripped tin-shell 14 or the tin-shellblank 40 yet to be deformed.

with the embodiment as shown in FIG. 4 but does not include thrusters38. An annular release plate 41 surrounds the stripper 35 and isconnected to the rod 42 of a compressed-air-actuated piston 43.Compressed air is attached to connections 44 and 45 to operate thedouble-acting disc-piston 43 that is slidably supported in a cylinder44. After each stripping process, the tin-shell 14 is pushed withcertainty below the level of the bottom edge of the stripper 35. Afterrelease, the release plate 41 returns immediately to its rest position.The rest plate 41 may also include a positive conical projection locatedon its face opposite the mouth of the tin-shell 14. This will achieve auniform installation of the release plate 41. A lobe 46 projecting farabove the top of the mouth of the can is seized by the annular releaseplate 41 with certainty and moved downwardly during the strippingoperation.

The release plate 41 is adjustable in height and serves only to act onthe tin-shell 14 after it has been stripped from punch 1. Plate 41 actsin the last instant of the stripping process to insure the subsequentconveyance of the tin-shell 14 in the direction of arrow A. The bottomoblique faces of the stripper fillet 37 effect the actual stripping ofthe tin-shell 114 from the punch 1. Fillets 37 are laid against theinner surface of the mouth of the tin-shell 14 over a large area.

Stripper fillets 37 are arranged symmetrically around the periphery ofthe stripper 35. Consequently, the stripping force is uniformlydistributed at the circumference of the mouth of the tin-shell 14thereby largely excluding an undesirable distortion of the tin-shell 14.

Referring again to FIG. 1, pre-stripper 4 acts under the influence ofthe spring 6 and compressed air fed through bore 7. This pre-strippingeffectuates a loosening of the workpiece from the punch in a manner thatis known.

While the embodiments have been described hereinabove to the process forstripping of a tin-shell of steel, it is expressly noted that any typeof metal container may be stripped from a punch member. The metal mayhave any type of cross-section and may be manufactured from other metalsor metal alloys, for example, aluminum or brass.

While the mechanism for stripping a drawn container from the punch of adeforming tool has been shown and described in detail, it is obviousthat this invention is not to be considered as being limited to theexact form disclosed, and that changes in detail and construction may bemade therein within the scope of the invention, without departing fromthe spirit thereof.

I claim:

1. In a mechanism for forming and stripping a container having a mouthwherein the container is formed on a punch during the inserting portionof a deformation stroke through a deforming die and stripped from thepunch during the withdrawing portion of the deformation stroke, thecombination comprising:

a. an annular stripper member located ahead of the deforming die anddisposed around and in a zone of movement during the deformation stroke,

b. said stripper member being effective to strip the container from thepunch during said withdrawing portion of the deformation stroke, and

c. beveled means adapted to act upon the peripheral edge of the mouthagainst a peripheral edge section of the deforming die to form aconically shaped widened portion along said peripheral edge of themouth,

d. said beveled means being effective to form said conically shapedwidened portion toward the end of the inserting portion of thedeformation stroke,

e. said stripper member including a stripper surface disposed obliquelywith respect to the axis of the punch,

f. said stripper surface being effective to abut said widened portion onthe withdrawing portion of the stroke causing the container to beremoved from the punch.

2. The combination as defined in claim 1 wherein said stripper member ismovably supported on the punch which includes a striker means forcarrying the stripper member forwardly to the peripheral edge of thedeforming die during said inserting portion of the deformation stroke,

a stationary holder is located ahead of said deforming die to maintainthe stripper member stationary during the withdrawing portion of saidstroke.

3. The combination as defined in claim 2 wherein said stationary holdercomprises a ring concentrically surrounding the punch and said strikermeans comprises an annular shoulder disposed around the periphery of thepunch.

4. The combination as defined in claim 1 wherein said stripper member ismovably supported on the punch and said beveled means also constitutessaid stripper surface and is located on the movable stripper memher.

5. A mechanism for forming and stripping a container having a mouth,comprising:

a. a deforming die and a punch means which cooperates with a die forforming a container,

b. said punch means being movable through a deformation stroke having aninserting portion and a withdrawing portion,

c. a movably mounted stripper means located ahead of the deforming dieand being effective to strip the container from the punch during thewithdrawing portion of the deformation stroke, and

d. said stripper means including a stripper member and a means forholding the stripper member stationary at a location laterally displacedahead of the deforming die,

e. beveled means located on the stripper member for abutting theperipheral edge of the container mouth against a peripheral edge sectionof the deforming die,

f. said beveled means being effective to form a conically shaped widenedportion along said peripheral edge of the mouth toward the end of theinserting portion of the deformation stroke,

g. said beveled means further being effective to abut said conicallyshaped widened portion during the withdrawing portion of the deformationstroke causing the container to be removed from the punch while thestripper member is stationary.

6. A mechanism defined in claim 5 wherein said stripper member comprisesa sleeve having a bottom edge surface tapered downwardly with respect tothe direction of movement and facing the die,

said bottom edge surface constituting both a stripper surface andWidener member,

said sleeve being held onto the periphery of the punch surface byadherent members.

7. A mechanism as defined in claim 6, wherein said adherent memberscomprise at least one friction ring disposed in the top section of saidsleeve.

8. A mechanism as defined in claim 6 wherein said adherent memberscomprised at least one permanent magnet disposed of the holding meansfor maintaining the sleeve within said holding means.

9. A mechanism as defined in claim 6 wherein said holding means includesa holder member having a bore in the shape of a trap-bush supportedconcentrically with respect to the axis of the punch means,

said trap-bush having an annular flange pointing radially toward theaxis of the punch at the upper face thereof,

the outer surface of said sleeve having the shape of a trap-bush atleast in its upper half tapered in a direction conically upwards to fitwithin the bore of said holder.

10. A mechanism as defined in claim 6 wherein said sleeve is cylindricaland has a row of lined bores disposed in parallel relationship withrespect to each other and the axis of the punch and being open at thebottom thereof,

said bores containing spring-loaded thruster members slidably supportedto move vertically between two end positions.

11. A mechanism as defined in claim 10 wherein the thruster members havethe shape of cylindrical pins and include lugs which project radiallyoutwardly at the bottom of said pins.

12. A mechanism for forming and stripping a container having a mouth,comprising:

a. a deforming die and a punch means which cooperates with the die forforming a container,

b. said punch means being movable through a deformation stroke having aninserting portion and a withdrawing portion,

c. stationary stripper means located ahead of the deforming die andbeing effective to strip the container from the punch during thewithdrawing portion of the deformation stroke, and

cl. beveled means located on the punch means for abutting the peripheraledge of the container mouth against a peripheral edge section of thedeforming die,

c. said beveled means being effective to form a conically shaped widenedportion along said peripheral edge of the mouth toward the end of theinserting portion of the deformation stroke,

f. said stripper means including a stripper surface effective to abutsaid conically shaped widened portion during the withdrawing portion ofthe deformation stroke causing the container to be removed from thepunch.

13. A mechanism as defined in claim 12 wherein said stripper meansincludes an annular sleeve which surrounds the punch means in the zoneof move- I ment for the punch means.

14. A mechanism as defined in claim 13 wherein said sleeve member isfastened to a press frame and includes a roll of stripper fillets whichproject from the inner wall of the stripper sleeve in the direction ofthe axis of the punch means in the correspond ingly shaped longitudinalgrooves located in the peripheral outer surface of the punch means.

said longitudinal grooves running parallel with re spect to each otherand the axis of the punch means, and

said fillets including bottom faces which exhibit a bevel whichcorresponds with the required angle of widening of the conically shapedmouth of the container.

15. A mechanism as defined in claim 14 wherein said stripper sleeveincludes a blind bore open at the bottom thereof between every twoadjacent strip per fillets,

each bore receiving a spring-loaded thruster which is movable betweentwo end positions.

16. A mechanism as defined in claim 15 wherein said thrusters have theshape of circular-cylindrical pins having lugs projecting toward theperipheral outer surface of the punch means at the bottom ends thereof.

17. A mechanism defined in claim 12 wherein a release plate meansencloses the bottom end section of the stripper sleeve,

said release plate being coupled to an actuating mechanism,

said actuating mechanism being effective to control the release plate inan up-and-down movement in response to the working cycle of the punchmeans.

18. A mechanism as defined in claim 17 wherein said actuating mechanismcomprises a double-acting, pneumatically controlled piston cylinderassembly.

1. In a mechanism for forming and stripping a container having a mouthwherein the container is formed on a punch during the inserting portionof a deformation stroke through a deforming die and stripped from thepunch during the withdrawing portion of the deformation stroke, thecombination comprising: a. an annular stripper member located ahead ofthe deforming die and disposed around and in a zone of movement duringthe deformation stroke, b. said stripper member being effective to stripthe container from the punch during said withdrawing portion of thedeformation stroke, and c. beveled means adapted to act upon theperipheral edge of the mouth against a peripheral edge section of thedeforming die to form a conically shaped widened portion along saidperipheral edge of the mouth, d. said beveled means being effective toform said conically shaped widened portion toward the end of theinserting portion of the deformation stroke, e. said stripper memberincluding a stripper surface disposed obliquely with respect to the axisof the punch, f. said stripper surface being effective to abut saidwidened portion on the withdrawing portion of the stroke causing thecontainer to be removed from the punch.
 2. The combination as defined inclaim 1 wherein said stripper member is movably supported on the punchwhich includes a striker means for carrying the stripper memberforwardly to the peripheral edge of the deforming die during saidinserting portion of the deformation stroke, a stationary holder islocated ahead of said deforming die to maintain the stripper memberstationary during the withdrawing portion of said stroke.
 3. Thecombination as defined in claim 2 wherein said stationary holdercomprises a ring concentrically surrounding the punch and said strikermeans comprises an annular shoulder disposed around the periphery of thepunch.
 4. The combination as defined in claim 1 wherein said strippermember is movably supported on the punch and said beveled means alsoconstitutes said stripper surface and is located on the movable strippermember.
 5. A mechanism for forming and stripping a container having amouth, comprising: a. a deforming die and a punch means which cooperateswith a die for forming a container, b. said punch means being movablethrough a deformation stroke having an inserting portion and awithdrawing portion, c. a moVably mounted stripper means located aheadof the deforming die and being effective to strip the container from thepunch during the withdrawing portion of the deformation stroke, and d.said stripper means including a stripper member and a means for holdingthe stripper member stationary at a location laterally displaced aheadof the deforming die, e. beveled means located on the stripper memberfor abutting the peripheral edge of the container mouth against aperipheral edge section of the deforming die, f. said beveled meansbeing effective to form a conically shaped widened portion along saidperipheral edge of the mouth toward the end of the inserting portion ofthe deformation stroke, g. said beveled means further being effective toabut said conically shaped widened portion during the withdrawingportion of the deformation stroke causing the container to be removedfrom the punch while the stripper member is stationary.
 6. A mechanismas defined in claim 5 wherein said stripper member comprises a sleevehaving a bottom edge surface tapered downwardly with respect to thedirection of movement and facing the die, said bottom edge surfaceconstituting both a stripper surface and widener member, said sleevebeing held onto the periphery of the punch surface by adherent members.7. A mechanism as defined in claim 6, wherein said adherent memberscomprise at least one friction ring disposed in the top section of saidsleeve.
 8. A mechanism as defined in claim 6 wherein said adherentmembers comprised at least one permanent magnet disposed of the holdingmeans for maintaining the sleeve within said holding means.
 9. Amechanism as defined in claim 6 wherein said holding means includes aholder member having a bore in the shape of a trap-bush supportedconcentrically with respect to the axis of the punch means, saidtrap-bush having an annular flange pointing radially toward the axis ofthe punch at the upper face thereof, the outer surface of said sleevehaving the shape of a trap-bush at least in its upper half tapered in adirection conically upwards to fit within the bore of said holder.
 10. Amechanism as defined in claim 6 wherein said sleeve is cylindrical andhas a row of lined bores disposed in parallel relationship with respectto each other and the axis of the punch and being open at the bottomthereof, said bores containing spring-loaded thruster members slidablysupported to move vertically between two end positions.
 11. A mechanismas defined in claim 10 wherein the thruster members have the shape ofcylindrical pins and include lugs which project radially outwardly atthe bottom of said pins.
 12. A mechanism for forming and stripping acontainer having a mouth, comprising: a. a deforming die and a punchmeans which cooperates with the die for forming a container, b. saidpunch means being movable through a deformation stroke having aninserting portion and a withdrawing portion, c. stationary strippermeans located ahead of the deforming die and being effective to stripthe container from the punch during the withdrawing portion of thedeformation stroke, and d. beveled means located on the punch means forabutting the peripheral edge of the container mouth against a peripheraledge section of the deforming die, e. said beveled means being effectiveto form a conically shaped widened portion along said peripheral edge ofthe mouth toward the end of the inserting portion of the deformationstroke, f. said stripper means including a stripper surface effective toabut said conically shaped widened portion during the withdrawingportion of the deformation stroke causing the container to be removedfrom the punch.
 13. A mechanism as defined in claim 12 wherein saidstripper means includes an annular sleeve which surrounds the punchmeans in the zone of movement for the punch means.
 14. A mechanism asdefined in claim 13 wherEin said sleeve member is fastened to a pressframe and includes a roll of stripper fillets which project from theinner wall of the stripper sleeve in the direction of the axis of thepunch means in the correspondingly shaped longitudinal grooves locatedin the peripheral outer surface of the punch means, said longitudinalgrooves running parallel with respect to each other and the axis of thepunch means, and said fillets including bottom faces which exhibit abevel which corresponds with the required angle of widening of theconically shaped mouth of the container.
 15. A mechanism as defined inclaim 14 wherein said stripper sleeve includes a blind bore open at thebottom thereof between every two adjacent stripper fillets, each borereceiving a spring-loaded thruster which is movable between two endpositions.
 16. A mechanism as defined in claim 15 wherein said thrustershave the shape of circular-cylindrical pins having lugs projectingtoward the peripheral outer surface of the punch means at the bottomends thereof.
 17. A mechanism as defined in claim 12 wherein a releaseplate means encloses the bottom end section of the stripper sleeve, saidrelease plate being coupled to an actuating mechanism, said actuatingmechanism being effective to control the release plate in an up-and-downmovement in response to the working cycle of the punch means.
 18. Amechanism as defined in claim 17 wherein said actuating mechanismcomprises a double-acting, pneumatically controlled piston cylinderassembly.